
20
6.6 Wiring example
(Fig.
6.6-1)
Shield
Connect only one side of the shield to the FG or GND terminal so that current
cannot flow through the shield. If both sides of the shield are connected to the
FG or GND terminal, the circuit will be closed between the shield and the ground.
As a result, current will run through the shield and this may cause noise.
Be sure to ground FG and GND terminals.
TXD
RXD
SG
FG
RTS
CTS
DSR
DTR
CD
2
3
7
1
4
5
6
20
8
IF-400
RXD
TXD
DCD
DTR
DSR
RTS
CTS
2
3
5
1
4
6
7
8
GND
RI
9
IF-400
Wire harness
Heater
Thermocouple
Electric furnace
Alarm unit
Single phase
Solid state relay
Host computer
7
6
5
4
3
2
1
EVENT
OUTPUT
+
-
MAIN
OUTPUT
+
-
-
-
+
+
A
B
B
TC
DC
RTD
INPUT
CT1
CT2
COM
YA(-)
YB(+)
24V
DC
+
-
POWER
SUPPLY
RS-485
3
4
2
1
SA-220-Z
24V DC
+
-
CT
NCL-13A-S/M
COM
YA(-)
YB(+)
D-sub connector 9-pin
D-sub connector 25-pin
D-sub connector 9-pin
D-sub connector 25-pin
CNS cable (Shinko model)
Host computer
Host computer